Why are placebos used?

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  1. #treatments
  2. #experimental
  3. #trials
  4. #control
  5. #physical
  6. #inactive
  7. #effect
  8. #overall
  9. #often
  10. #study
  11. #researchers
  12. #devices
  13. #under
  14. #better
  15. #evaluate
  16. #treatment
  17. #acupuncture
  18. #clinical
  19. #placebos